@Saraalen123
When I look back there were other abusive behaviours from my exH, but the lies were the thread that ended up unravelling everything. If it helps you at all to know what I did with my lying exH:
When I decided enough was enough I sat him down, told him that either he made some serious and continued effort to stop lying and rebuild trust or I would have to leave.
I had a fixed time frame in mind of 6 months - how long I was willing to give him but I didn't tell him this! I did not want him to pull out all the stops and pretend for 6months, lulling me into a false sense of security and then go back to the lies.
I lasted 3. He made no effort at all and kept trying to put it all back on me, firstly by deferring all responsibility on to me because he "didn't know what to do" and then getting angry and placing the blame for his lies squarely at my feet eg: didn't want to worry me/argue/me to get upset etc. I am not the sort of person to get upset or angry about the things he was lying about and I worried more not knowing/finding stuff out last minute. These were all excuses and a way to keep me on the back foot by wondering if I was a horrible wife. Which I did, a lot! I worried I was being overly sensitive/difficult/unreasonable/going insane etc!
He was also telling other people lies, giving them the idea that I was one or all of the above, while downplaying his part in everything.
In hindsight, I should have left after he lied to me the second time in our relationship (in the early days), every time I found out a lie and stayed I gave him permission to keep lying to me. We were together for 9 years. Staying for those final 3 months was 2 and a half months too long when he didn't make any effort at all.
However in that time I moved into the spare room, made my plan to leave and started to distance myself emotionally when it became clear he had no intention of changing.
After I left it was another 3 months of him promising big changes only for me to find there were none. I got sucked back in a few times until I finally realised that he would never change. He didn't want to, he just wanted me to put up and shut up.
One time, during an argument I got sucked into (stupid me) over why I had left him, he said "FFS I know I lie but why can't you just pretend I don't?!" I was just floored by that 
I remember sitting there with my mouth open full of gobsmacked rage, then laughing, then crying, rinse and repeat. That just explained everything about how he felt about me and our relationship in one concise statement!
He could do what he liked, behave how he liked, lie at will and generally distort my reality and I was just supposed to sit quietly, never question him and play at the happy, sexually available and dutiful wife 
I ended up blocking him on everything because when I told him it was finally over he turned quite verbally nasty, look up the abusers' script to read what is usually said by these men (there's probably one for liars too) it is very useful as a tool to prepare yourself should he start spouting the usual hateful bilge. It's very odd because they all say the same things, almost like they are taught it somewhere!
Get in touch with women's aid, they are brilliant, kind and helpful. They can get you counselling, help with filling out forms and general planning if you decide to leave.
Do you have anyone in RL who you can talk to, a friend or one of your (not his) family members?